Liquid-operated tipping-jack.



C. DEWALD.

LIQUID OPERATED TIPPING JACK.

APPLICATION FILED FEB. 23. 1916.

,1,23? 3O9@ Patented Aug. 21, 1917.

Fly 1.

CHARLES DEWALD, OF BOULOGNE-SUR-SEINE, FRANCE.

LIQUID-OPERATED TIPPING-JACK.

Specification of Letters Patent. Patented A g; 2] 191% Application filed February 23, 1916. Serial No. 80,063.

To all whom it may concern:

Be it known that I, CHARLES DEWALD, manufacturer; a citizen of the Republic of France, residing at 92 Rue Denfert-R-ochereau, Boulogne-sur-Seine, Seine, Republic of France, have invented new and useful Improvements in Liquid-Operated Tipping- Jacks, of which the following is a specification.

My invention relates to jacks operated by water or other liquid under pressure and adapted for tipping over the tumbler or bridge of motor lorries and the like and refers to that type of such apparatus in which the jack cylinder is provided with hollow journals through which the liquid under pressure flows into and out of such cylinder and the object of my improvements is to provide for connections between the hollow cylinder-journals and the ducts for the ingress and egress of the liquid under pressure of a design such as to enable the use of fixed pipes for the admission and evacuation of said liquid to and from the hollow journals of the jack cylinder, thus avoiding theuse of the flexible pipes generally employed up to now with apparatus of this description and I liable to burst or leak.

I attain these objects by the mechanism illustrated in the accompanying drawing in which Figure 1 is a top view of thecylinder journals partly in section.

Fig. 2 is a vertical section of one of the journals and of its connecting device on .an enlarged scale and v Fig. 3 a cross section according to line (A-A) of Fig. 2.

Similar letters refer to similar parts throughout the several views.

Referring to Fig. 1, 1 is a bracket in which the jack cylinder is mounted and ending in two journals 2 and 3 pivoted in bearings 4c and 5. The outer ends of said journals 2 and 8 are provided with connections affording a perfect security against leakage whatever the pressure in the ack cylinder may be, without preventing in any way the journals 2 and 3 from rotating.

According to Fig. 2, said connections consist of a fixed cap 6 supported at one end on ------part 7 and at the other end on the. reduced end 8 of journal 2. The cap 6 is maintained in a fixed position by means of a plug-screw and washers 9 screwed longitudinally in perforation 10 and preventing any lateral displacement of cap 6 without hindering the. rotation of journal 2 relatively to said lixed cap and to the bearing +1. The circular groove 11 communicates with the axial perforation 10 of journal 2 by means of two or four perforations 12; the lower part ol" rap 6 is formed in the shape of a connecting member 13 (Fig. 2), the perforation ll of which communicates with the circular grom'e 11 whose lateral sides are provided with cup-shaped packing-rings 15 of leather or any other suitable material insuring perfect security against leakage. Member 1; of cap 6 is connected by means of an inwardly threaded sleeve 16 to the fixed duct 17.

As will be clearly understood from the aforesaid, the described connecting device will provide perfect security against leakage without preventing in any way the rotation of the cylinder journals in theirbearings, the use of flexible ducts being thus avoided.

I claim:

1. In a jack or other device operated by fluid under pressure, a bearing, a journal mounted to turn in said bearing and provided with a projecting end having two successive reductions of its diameter to form two shoulders, said journal being provided with a longitudinal channel and with outward channels extending from said longitudinal channel to the outer surface of the journal at its reduced end, a stationarj sleeve or cap having one end in loose or swivel engagement with said reduced end of the journal, the other end of said sleev e being adjacent to that shoulder of the journal which has the larger diameter. the interior (llfln1t61\ 0f said sleeve being. for the greater part of its length, materially larger than that of the\ reduced end of the journal, so as to form an annular chamber around and means for preventing or limiting r elative longitudinal movement of the 'sleeve and journal.

2. In a jack or other device operated by fluid under pressure. a stationary sleeve whose interior diameter is relatively small at one end and materially larger for the greater part of its length, forming an interior shoulder facing the larger end of the sleeve, a journal mounted to turn in said sleeve and having an end portion of reduced having a shoulder at the junction of its saidtwo portions, and being provided with a longitudinal channel and with a passage connecting said channel with said annular chamber, while the said sleeve has a supply channel leading to said chamber.

3. In a jack or other device operated by fluid under pressure, a stationary sleeve whose interior diameter is relatively small at one end and materially larger for the remaining part of its length, forming an interior shoulder which faces the larger end of the sleeve, a journal mounted to turn in said sleeve and having an end portion of reduced diameter fitting the smaller bore at,

one end of the sleeve, and a portion of larger diameter engaging the inner wall of the large-bore portion of the sleeve, but for a portion of its length only, thus leaving the remaining portion of the said large-bore in-' supply channel leading to said chamber, and

washers, located within said chamber at opposite sides of said supply channel and engaging respectively the shoulder on the sleeve and the shoulder on the said journal.

' CHARLES DEWALD.

Witnesses: Sns'rrzon Ror, G. J UMMLER. 

